Ответ:
1. Steve is very tired, so he's taking a nap in his room.
2. Не знаю.
3. When is the play starting.
4. Не знаю.
5. Tina speaks 2 (two) languages.
6. I'm still waiting for my friend's letter.
7. What is he thinking about?
8. He's taking 4 (four) courses this semester.
9. Anna is trying to improve her French this month.
10. I don't know his brother.
11. Look at him! What is he doing?
12. Sam certainly isn't having any fun right now.
13. Do you always lock the door when you leave?
14. Look it's starting to rain!
16. Listen! Somebody is knocking on the door.